try and find out how far both the "suicide" detonation and the police induced detonation were from the location of the buses. what time of day did this occur? was it still light out? does the area near the buses have security, is it well lit, is it in a visible area where people would take notice of someone attaching a bomb to the side or underneath a bus?
Isn't it true that the bomb squad would simply deactivate any additional bombs, rather than blow them up and lose the evidence which they'd provide intact as to who and what made the bomb?
Thus any explosions heard and felt would not be from any "induced detonation."
It was dark and the buses that sit along the oval have very little light around them -- not enough to notice someone doing anything. I have no idea if the bus drivers stay with their buses or not except they announced several times for bus drivers to come to a place to move their buses which told me they are in watching the game. I have no knowledge of that.
Picture in your mind a street that runs on the west side of Cross that loops around on the east side of Cross -- it is a short walk between the two parts of the street. The east part of the street goes between Cross and the parking garage attached to the stadium. Buses are parked all along that loop on game days. To the west side of the road as it comes in that part of a campus is a large oval with trees, flowers and a fountain. Kids play football there before games when they are early. I have always thought that part of campus when we walk back after night games is not well lit.